Quiz #5

Question 1

The standard measuring unit of wire by its cross-sectional
area, as used in American wire tables is the
__________.

Answer 1

circular mils

Question 2

Which of the AWG wire sizes listed below would have the smallest diameter?
A   0000
B   0
C   14
D   250

Answer 2

C 14

Question 3

Which of the following statements concerning copper wire sized by AWG numbers is correct?
A Number 12 AWG wire has a higher current rating than 10 AWG wire.
B Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG wire at 25°C.
C Number 10 AWG wire has a higher dielectric strength
than 12 AWG wire.
D Number 12 AWG wire is larger than number 10 AWG
wire.

Answer 3

B Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG
wire at 25°C.

Question 4

A conductor with a cross-sectional area of one circular mil would have a diameter of __________.

Answer 4

0.001 inches

Question 5

Which of the following materials is a good electrical insulator? 
A   wood 
B   silver 
C   copper 
D   gold

Answer 5

A wood

Question 6

A common type of protective covering used on electrical

conductors is __________.

Answer 6

rubber or plastic

Question 7

Which of the following statements best describes the material known as varnished cambric?

Answer 7

Cotton cloth coated with insulating varnish.

Question 8

Which of the listed classes of electrical insulation is suited for the highest operating temperature?

Answer 8

Class 180 (H)

Question 9

Most conducting materials such as copper, aluminum,

iron, nickel, and tungsten __________.

Answer 9

increase in resistance with

increased temperature

Question 10

The reason some electric cables are formed of stranded wire is to __________.

Answer 10

increase their flexibility

Question 11

Which of the following characteristics is most critical in determining the size of the cable to be used in a particular circuit?

Answer 11

current rating

Question 12

The existing resistance of a conductor is dependent

upon its length, cross-sectional area, __________.

Answer 12

material and temperature

Question 13

Electrical wire in general, when used aboard vessels
must meet minimum requirements. Which of the
following statements is/are correct?
A Each wire must be 14 AWG or larger, regardless of locations and use.
B Wire must be copper stranded.
C The only wire that does not have to be in a suitable
enclosure or cover is the ground wire used with portable tools and lights.
D All of the above.

Answer 13

B Wire must be copper stranded.

Question 14

The resistance of a conductor varies __________.

Answer 14

directly as its length and inversely as its cross-sectional area

Question 15

The resistance of electric wire will decrease as its

__________.

Answer 15

cross-sectional area increases

Question 16

When the current flow through a copper wire increases, its __________.

Answer 16

temperature will increase

Question 17

A wire is being used as a replacement having twice the
length and one-half the cross-sectional area of the
original wire. The resistance of this new wire, when
compared to that of the original wire, is __________.

Answer 17

four times as great

Question 18

The proper way to apply plastic electrical tape to an

electric cable splice is to __________.

Answer 18

wind the tape so that each turn overlaps the turn before it

Question 19

Which of the following statements concerning copper wire sized by AWG numbers is correct?

Answer 19

Number 12 AWG wire at 25°C has more resistance per 1000 ft than 10 AWG wire at 25°C.

Question 20

The heating of conductors as a result of resistance in a
distribution circuit causes a power loss expressed as
__________.

Answer 20

line loss